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CSE 2221 Midterm 2 Exam Questions and answers
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CSE 2221 Midterm 2 Exam Questions and answers
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CSE 2221 Midterm 2 Exam Questions andanswers
Declared Type - - Also known as static type
Left side of Declaration
Interface Type
Cannot change during runtime
- Object Type - - Also known as Dynamic type, because this part of a
variable can change during runtime
Right side of declaration statement
Constructor
Anything that implements interface can be used for this
Type used with overriden method calls
- How to Override a method? - - Must be a class extending a class
(e.g. myNaturalNumber extends NaturalNumber2)
Use @override
Keep same method header, change method body
- Extends - - Relationship between two classes or two interfaces
With classes, retains the method bodies
With interfaces, retains the method contracts
- Implements - - Relationship between class and interface
Class _______________s an interface
Class may do this with more than one interface
More than one class can do this with one interface
- What kind of variable is NaturalNumber? - - A reference type, points to an
object value
, - How do i initialize a natural number with a number bigger than the max
value of an int? - - Use another natural number, a string with said number,
or math to get there
- What is the default parameter mode when none is specified? - - Restores
Mode
- Restores - - Returns input variable to its original value at the end of the
method
- Updates - - Changes the value of the input variable based on its original
value
- Clears - - Returns the value of the input variable to a default value, usually
zero
- NaturalNumber Compareto Results - - positive if A > B
0 if A = B
Negative if A < B
- Replaces - - Changes the value of the input variable regardless of the
orgiinal value
- Immutable Reference - - Has a reference value and an object value
Variable value cannot be changed in a method cal]
Value can be reassigned, but not directly changed by a method call
Example: String, XMLTree
- Mutable Reference - - Has a reference value and an object value
Example: NaturalNumber, simpleReader, simpleWriter, Array
- Primitive type - - Has a value that can be directly changed, the variable is
the value
Double, int, char, boolean
- Test cases should include - - Routine Cases
Challenging Cases
Boundary Cases
They also must satisfy the preconditions
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